Hi everybody, I have a 30cm cube aquarium that I am going to set up as a reef, I know a lot of people will say that a 6 Gallon tank is way to small, but I have experimented with a thew different marine aquariums now and I have done a lot of research and I feel I am now ready to set up a tank of that size. I have a hang on the back filter that I am going to use as my filtration and to create sufficient water movement and I had planned to get a small heater for the tank that would be able to fit inside the filter itself, however after reseaving the filter I realised that it was about 1cm too small to fit the heater I had planned on getting. ☹️ Does anyone have any reliable heater suggestions (The heater needs to be under 15cm in height)
the heater also needs to be able to heat around 5-6 gallons of water. Thanks in advance.